jerry sandusky will face his accusers in court. they're expected to give details under oath about how sandusky molested them years ago. but the prosecutor's star witness may be changing his tune. >> reporter: this started with what mike mcquery saw. did the assistant coach actually see jerry sandusky sodomize a 10-year-old boy in a penn state shower in 2002 or just hear what he thought was a sex act. according to an article in the patriot news, a friend of the mcquery family told the grand jury he spoke with him on the night of the alleged incident and that mcquery said he never saw sandusky having sex with a boy. >> mcquery is the only eyewitness. >> reporter: penn state students rioted when joe paterno was fired. he insists mcquery never saw it. >> these allegation are false. i didn't do those things. >> reporter: that will be the big issue during the preliminary hearing, put it star witness is deemed too inconsistent, that could jeopardize the case against sandusky. >> it is significant. if it's true that hey's giving these diff